Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0c18e8ad3732d880ea6cb688970782165d38f4fa3c55da59d1a1aa38a3858b6e' 
  AND token = 'IB8uwCndq42ybYCN/pExoNEulG0cqlLHFF1yYzGysEI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}